Build a “Brand Twin” That Writes Every Post in Your Exact Voice

Learn how to create a custom GPT “Brand Twin” that writes LinkedIn posts, Instagram captions, and other copy in your specific brand voice. You will produce a reusable GPT trained on your brand kit, writing samples, and a forbidden-word list, helping you spend less time editing generic AI output.

• Marketing managers who are tired of rewriting most AI-generated copy
• Content leads who want to scale a specific brand voice across a team
• Entrepreneurs who do not know where to start with their brand voice

A custom GPT “Brand Twin” trained on your specific brand kit, best writing samples, and a forbidden list of corporate clichés and AI-isms.

• Custom GPT system instructions based on your brand DNA
• Uploaded writing samples and optional brand kit inside the GPT
• A pinned GPT that your team can reuse for brand-aligned copy

• ChatGPT Plus ($20/month)
• 3–5 samples of your best writing, such as PDFs, markdown files, or text files
• Optional: a brand kit slide deck

• Test your new GPT by using the same prompt in your Brand Twin and in a temporary ChatGPT thread, then use the comparison to refine your system instructions.
• If a teammate writes copy for your brand, have them add the GPT and ask it to grade how well their copy fits your brand voice on a 1–10 scale.